Wall Sleeve Damper Venting With Low-Pressure-Loss Airflow
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Solution Overview
Problem
Existing wall boxes for ventilation require electrical energy for operation, are complex and expensive to manufacture, prone to failure, and suffer from high pressure losses and assembly difficulties, especially when installed in walls with horizontal airflow.
Innovation Solution
A wall box design that operates without electrical energy, featuring a hyperbolically shaped flow body and guide body to minimize pressure loss, with a sealing cover that opens and closes automatically based on airflow, guided by axial arms and utilizing a spring or weight for restoring force, and incorporating magnets for secure closure and insulation to prevent soiling and turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrical sensors and control systems are used to open and close the cover, then the ventilation can be controlled, but the device complexity and manufacturing cost increase
Solution Approach 1:
The cover is designed to open and close automatically using the kinetic energy of the airflow itself. The aerodynamic profile of the cover creates pressure differences that naturally drive the opening motion when airflow is present, and allow closing when airflow stops, eliminating the need for external sensors or control systems
Solution Approach 2:
The patent replaces complex electrical control systems with a purely mechanical aerodynamic system. The cover's shape and positioning create airflow-dependent forces that automatically control opening and closing, substituting electronic components with fluid dynamics-based mechanical action
2Ease of operation
If electrical wiring and energy supply are provided to the wall box, then the cover can be controlled, but the installation complexity and cost increase
Solution Approach 1:
The system uses the kinetic energy of the passing airflow itself to power the opening mechanism. No external energy supply or wiring is needed - the airflow provides both the control signal and the mechanical force needed to open the cover, simplifying installation to just mounting the device in the wall opening
3Ease of manufacture
If a simple cover design is used, then the manufacturing cost is reduced, but the pressure loss increases
Solution Approach 1:
The cover features a specifically shaped aerodynamic profile with curved surfaces designed to guide airflow smoothly. This curved geometry reduces flow separation and turbulence, minimizing pressure loss while maintaining a relatively simple single-piece construction that keeps manufacturing costs low
4Productivity
If the closure cover blocks due to its own weight in horizontal flow, then the ventilation is ineffective, but this is unavoidable with simple designs
Solution Approach 1:
The aerodynamic profile of the cover generates lift forces from the passing airflow that counteract the gravitational force on the cover. The shaped surface creates pressure differences that produce an upward aerodynamic force balancing the weight, preventing the cover from blocking in horizontal installations
Solution Approach 2:
The cover transitions from a static blocked position to a dynamic open position based on airflow conditions. The aerodynamic forces change with flow velocity, automatically adjusting the cover position - blocked when no flow, open when flow is present - optimizing ventilation effectiveness for different operating conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a simple, cost-effective, and reliable ventilation system with minimal pressure loss, easy assembly, and reduced maintenance, as the wall box opens and closes automatically with airflow, ensuring secure sealing and efficient airflow without electrical control or wiring.
Implementation Method 1
the wall box opens automatically to the desired width through the energy of the air flow
Implementation Method 2
a flow body is attached to the inside of the closure cover, which directs the air flow formed by the pressure difference past the edge of the closure cover
Implementation Method 3
The restoring force is brought about by a spring which pulls the cover into its closed position
Implementation Method 4
In the embodiment with the spring, this engages the center point of the closure cover via a pivot lever
Data Source
Figure 1~2
Figure 3~4
AI summary
A wall incorporates an air vent that is opened and closed by pressure difference. The ventilator flap closure (5) is located within a pipe (2) and moves independently under air pressure against a spring (22).